I cannot figure this out. Here is what I know so far on my quest for a PC1066 speed system.
Below is the summary of what I have tested so far. I am not sure what else to do. The way I am testing is by booting off a bootable Memtest86 v3.0 CD. This is a CD I created by downloading the ISO from www.memtest86.com . This allows me to see the memory speed and tests the memory for errors. The odd thing about this is that my friend has also built a computer based on the same GA-8IHXP motherboard and OCZ RAM and he gets the same problem as I. That is why I have thought all along that this was not user error but something with the Mainboard/RAM.
Below is the original system I started out with. This system runs great at PC800(400MHz) speeds but when I try and run the system at PC1066(533MHz) the system gets non-stop memory errors.
After trying to troubleshoot why the system above did not work and some research on the Internet I though it was a RAM problem. I called OCZ and they stated the RAM would not work in that board (they had a known SPD issue) and that Kingston would. So I ordered some Kingston memory which made the test setup look like the system below. The problem with this is that the system would not run at either PC800 or PC1066 speeds with the Kingston installed.
Motherboard: Gigabyte GA-8IXP, BIOS F4
Processor P4 2.80GHz/533MHz
Memory: 2x Kingston 256MB PC1066 (KVR1066X16-8/256)
Memtest86 v3.0 results @ PC800 speed: FAIL (system will not run)
Memtest86 v3.0 results @ PC1066 speed: FAIL (system will not run)
Now I started thinking that the problem was with the motherboard and not the memory since I had now tried two different brands of PC1066. I purchased an Asus P4T533-C since the guy at OCZ said they had no issues with that board and I know Asus has a pretty good reputation. This system also has the same issue as the Gigabyte, it runs great at PC800 but fails at PC1600.
So after all of this I still do not have a system that will run at PC1066 speeds. I have no real clue on what to try next. I don't really think the power supply could cause this and I have tried these tests with every card removed (SCSI and Audigy) and get the same results. I also don't think it is a problem with Memtest86 since the system is only stable when I get passing scores. If I try to boot the OS at any of the speeds that fail the Memtest86 test the system will not boot.
OK, first of all, OCZ memory is not good, they have a very high failure rate. Now, Kingston memory is usually quite good, but they have a slightly higher than normal failure rate. The chances of you getting problematic OCZ memory are probably over 50%, the chances of getting problematic Kingston is probably around 10%.
Either you have bad luck, a bad board (not likely to happen twice), or a power problem. Luckily your Gigabyte board has a way to adjust memory voltage.
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Ok, just to see what I would get I downloaded the memtest86 tool and tried it on my Gigabyte board to see the results. I have the same configuration as you using the Kingston PC1066 memory. I did a manual setting in the bios for 1066 and 800 and both test completed without errors. My only question is, did you test by just changing the BIOS setting? I am assuming so but let me know and I will be happy to see what I get in my system.
Did you try running 8HIXP and 8/256 1066 kingston memory with BIOS setting for FSB speed by HARDWARE and Memory Type AUTO? I have found that if you change settings to any other combo system will run very slow once you get it up. Any other settings used on 8iHXP f4 BIOS and kingston 8/256M 1066 RIMM disable fast small block data tranfers from memory to L1 / L2 cache. Using Sandra to BM you will see cache performance slow down from 25GB/s to 2GB/s. Memory BW and CPU arithmetics all go down to 1/3 performance due to this as well.
I am quite sure that there is a lot of 1066 RAM out there that appears to be untested at full operating speeds. The good news about memtest-86 is it performs tests of memory at actual system speeds. If you go to munchkin web site you see that they actually tout that they use memtest-86 to test every memory module before they ship it. Of course they charge more for their memory.
If you can't get memtest-86 to run cleanly in with FSB in HAREWARE mode and MEMORY TYPE AUTO then call Kingston and get them to cross ship you new RIMMS.
My system seems to have an opposite effect from yours.
I am using 2.4B with 2X256 40ns Samsung PC800 and F6 bios.
When I first installed my system, I manually changed the RDRAM Bus Frequency from Auto to PC800, and the system crashed during Win XP installation. After I changed the Bus Frequency back to Auto, and FSB by Hardware everything runs fine. Then I tested out the memory benchmarks in SiSoft, much to my surprise I am running at PC1066 speeds. I thought having the RDRAM Bus Frequency set to Auto should make my ram run at PC800 speeds since that is the speed they are suppose to run at. I am still scratching my head on this one, but can't really complaint